An SOx (x = 2, 3) sensor using β-alumina/Na2SO4 couple

Akila, R. ; Jacob, K. T. (1989) An SOx (x = 2, 3) sensor using β-alumina/Na2SO4 couple Sensors and Actuators, 16 (4). pp. 311-323. ISSN 0250-6874

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A solid-state sensor for SOx (x = 2, 3) species has been designed using β-alumina as the solid electrolyte and Na2SO4 as the auxiliary electrode. The measured e.m.f. of the cell Pt, O'2 + SO'2 + SO'3|Na2SO4||β-alumina||Na2SO4|SO''3 + SO''2 + O''2, PT in the temperature range 700 K to 1150 K agrees well with values calculated using the Nernst equation. The sodium sulphate acts both as a protective covering, preventing direct access of the gaseous SOx species to the β-alumina electrolyte, and as an auxiliary electrode, converting chemical potentials of SOx species and O2 into an equivalent sodium potential. The open-circuit e.m.f. varies non-linearly with temperature for fixed composition of inlet gas mixtures containing SO2, O2 and Ar. The response time (t0.99) of the cell varies between 1.9 ks at 750 K and 0.06 ks at 1100 K. The e.m.f. response is faster when the partial pressure of SOx at the electrode is increased than when it is decreased.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:12833
Deposited On:11 Nov 2010 08:47
Last Modified:03 Jun 2011 09:51

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